Friction is a variable, a wheel has friction in the wheel
bearing and on the tread to the pavement. The pavement when
clean and dry has a fairly stable Mu which is a coefficient
from perfect friction to no friction.

If there is water or ice, the actual friction may change
second by second as the temperature changes or more
precipitation falls.

It would be nice if somebody built a runway 3,000x24,000
feet with a Teflon surface so pilots could practice
controlled landings. How slick is oiled Teflon?


--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


"Newps" wrote in message
...
|
|
| Capt.Doug wrote:
| "Icebound" wrote in message WHY would not the US
adopt it?
|
|
| The US already has a system?
|
| The big airports can provide runway traction reports
measured in 'Mu'. These
| reports are much more useful than pilot reports.
|
| Yes, our airport can report in mu. I have yet to find the
airline pilot
| who finds those three numbers useful. They always ask for
the standard
| braking action report.